Question 1042702
{{{P(X < 700) = P((X-800)/100 < (700-800)/100 = -1) = P(Z < -1) = 0.1587}}}

===> Around 0.1587*500,000 = 79,350 electric bulbs will will have lives that are less than 700 hours.


===> The company can expect to pay 79,350*Php 3.00 = PhP 238,050 for bulbs replaced under guarantee.